Generally, we need just 1 good quality and clear photograph of the individual needed to be sculpted on the bobbleheads.
Sculpting, especially when the subject is a human, is a very subjective process. It is an art, not a science. Since all the sculpting is done based on photographs (which may or may not be good likenesses of the subject), the quality of the photo provided is very important in achieving a strong likeness. But even with a good photo, because of the subjectivity involved with the art of sculpting, some people may see a strong resemblance to the person, and others may not. With a good photo, however, we should be able to obtain a good likeness with our specially-trained artists.